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Alnylam Presents New Pre-clinical Data On ALN-AT3, An RNAi Therapeutic Targeting Antithrombin (AT) For The Treatment Of Hemophilia And Rare Bleeding Disorders

Alnylam Pharmaceuticals, Inc. (Nasdaq: ALNY), a leading RNAi therapeutics company, announced today that it has presented new pre-clinical data from its RNAi therapeutic program for the treatment of hemophilia and rare bleeding disorders. The data were presented at the XXIV Congress of the International Society on Thrombosis and Haemostasis (ISTH) being held June 29 – July 4, 2013 in Amsterdam. The new pre-clinical data demonstrate that ALN-AT3, a subcutaneously administered RNAi therapeutic targeting antithrombin (AT), can normalize thrombin generation and improve hemostasis in hemophilia mice and fully correct thrombin generation in a non-human primate (NHP) hemophilia “inhibitor” model. ALN-AT3 is a key program in the company’s “Alnylam 5x15” product strategy, which is aimed at advancing five RNAi therapeutic programs directed toward genetically validated disease targets into clinical development – including programs in advanced stages – by the end of 2015. ALN-AT3 utilizes the company’s proprietary GalNAc conjugate delivery platform which enables subcutaneous dose administration.

“Hemophilia and other rare bleeding disorders are characterized by deficiencies in clotting factors that ultimately lead to inadequate thrombin generation and a bleeding phenotype. ALN-AT3 is aimed at correcting these defects by knockdown of AT – an endogenous anticoagulant – thus, increasing thrombin generation and improving hemostasis. This innovative approach is strongly supported in human genetics by findings in hemophilia patients who have co-inherited prothrombotic traits, including AT deficiency, and are characterized with a mild bleeding phenotype,” said Akshay Vaishnaw, M.D., Ph.D., Executive Vice President and Chief Medical Officer of Alnylam. “We are very excited by these new data with ALN-AT3 which demonstrate normalization of thrombin generation and improvement of hemostasis in hemophilia models. Most importantly, we have demonstrated that ALN-AT3 can fully correct thrombin generation in a non-human primate hemophilia ‘inhibitor’ model, providing key proof of concept for our program. Finally, by administering highly exaggerated doses of ALN-AT3 to wild type and hemophilia animals, we’ve demonstrated that our RNAi therapeutic has a very wide therapeutic index in the hemophilia setting. We remain on track to file an investigational new drug application for ALN-AT3 in mid-2013 and to initiate our Phase I study in late 2013.”

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